I'm trying to understand how OpenSSH decides what key exchange method to use. What I don't see is how to specify the method. In addition, I know every ssh server/client is required to support at least two methods:
diffie-helleman-group14-sha1, but its unclear to me how the server and client to choose between the two, given that each program must support both. I would think that in every case
diffie-helleman-group14-sha1 is used since it has the larger MODP group.
I can specify the cipher and the MAC:
ssh <user@ip> -c aes256-cbc -m hmac-sha1
but looking in the manpages I don't see an equivalent option for the key exchange. Can someone 1) tell me a way to specify this 2) explain how ssh chooses the method? (I suspect it always picks the first in the list, meaning the second is never, ever selected)